function s1_helloworld() {
echo "hello,world!"
}
function s2_tell_who_i_am() {
whoami
}
function s3_which_distro_do_i_use() {
if[-f/etc/os-release];then
	source/etc/os-release
    echo "NAME=\"$NAME\""
else
	echo"无法确定发行版"
fi
}
function s4_view_my_cpu_arch() {
uname -m
}
function s5_show_first_scsi_disk_size() {
local disk_size)bytes=$(lsblk -b|grep -E'^sda'|awk'{print $4}')
if[ -n "$disk_size_bytes"];then
	local disk_size_gb=$(echo"scale=0;$disk_size_bytes/1000000000"|bc)
	echo "$disk_size_gb"
else
	echo"未找到第一块SCSI硬盘"
fi
}
function s6_show_main_memory_size_in_megabytes() {
free -m |grep "Men:" |awk '{print $2}'
}

